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#ifndef lint |
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static const char RCSid[] = "$Id: calc.c,v 1.8 2013/12/19 16:56:31 greg Exp $"; |
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#endif |
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/* |
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* calc.c - simple algebraic desk calculator program. |
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* |
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* 4/1/86 |
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*/ |
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|
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#include <stdlib.h> |
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#include <setjmp.h> |
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#include <ctype.h> |
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|
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#include "rtio.h" |
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#include "rterror.h" |
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#include "calcomp.h" |
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|
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#define MAXRES 100 |
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|
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double result[MAXRES]; |
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int nres = 0; |
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|
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jmp_buf env; |
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int recover = 0; |
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|
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|
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int |
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main(int argc, char *argv[]) |
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{ |
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char expr[2048]; |
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char *epos; |
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FILE *fp; |
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int i; |
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char *cp; |
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|
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esupport |= E_VARIABLE|E_INCHAN|E_FUNCTION; |
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esupport &= ~(E_REDEFW|E_RCONST|E_OUTCHAN); |
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#ifdef BIGGERLIB |
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biggerlib(); |
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#endif |
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varset("PI", ':', 3.14159265358979323846); |
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|
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for (i = 1; i < argc; i++) { |
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cp = getpath(argv[i], getrlibpath(), 0); |
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if (cp == NULL) { |
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eputs(argv[0]); |
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eputs(": cannot find file '"); |
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eputs(argv[i]); |
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eputs("'\n"); |
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quit(1); |
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} |
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fcompile(cp); |
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} |
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setjmp(env); |
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recover = 1; |
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eclock++; |
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|
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epos = expr; |
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while (fgets(epos, sizeof(expr)-(epos-expr), stdin) != NULL) { |
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while (*epos && *epos != '\n') |
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epos++; |
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if (*epos && epos > expr && epos[-1] == '\\') { |
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epos[-1] = ' '; |
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continue; /* escaped newline */ |
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} |
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*epos = '\0'; |
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epos = expr; |
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switch (expr[0]) { |
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case '\0': |
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continue; |
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case '?': |
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for (cp = expr+1; isspace(*cp); cp++) |
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; |
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if (*cp) |
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dprint(cp, stdout); |
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else |
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dprint(NULL, stdout); |
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continue; |
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case '>': |
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for (cp = expr+1; isspace(*cp); cp++) |
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; |
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if (!*cp) { |
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eputs("file name required\n"); |
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continue; |
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} |
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if ((fp = fopen(cp, "w")) == NULL) { |
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eputs(cp); |
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eputs(": cannot open\n"); |
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continue; |
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} |
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dprint(NULL, fp); |
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fclose(fp); |
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continue; |
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case '<': |
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for (cp = expr+1; isspace(*cp); cp++) |
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; |
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if (!*cp) { |
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eputs("file name required\n"); |
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continue; |
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} |
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cp = getpath(cp, getrlibpath(), 0); |
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if (cp == NULL) { |
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eputs("cannot find file\n"); |
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continue; |
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} |
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fcompile(cp); |
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eclock++; |
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continue; |
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} |
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if ((cp = strchr(expr, '=')) != NULL || |
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(cp = strchr(expr, ':')) != NULL) { |
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if (cp[1]) |
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scompile(expr, NULL, 0); |
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else if (*cp == '=') { |
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*cp = '\0'; |
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if (!strcmp(expr, "*")) |
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dcleanup(1); |
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else |
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dclear(expr); |
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} else { |
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*cp = '\0'; |
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if (!strcmp(expr, "*")) |
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dcleanup(2); |
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else |
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dremove(expr); |
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} |
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eclock++; |
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} else { |
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printf("$%d=%.9g\n", nres+1, |
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result[nres%MAXRES] = eval(expr)); |
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nres++; |
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} |
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} |
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|
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recover = 0; |
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quit(0); |
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return 0; /* pro forma exit */ |
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} |
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|
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|
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double |
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chanvalue(n) /* return channel value */ |
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int n; |
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{ |
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if (n == 0) |
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n = nres; |
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else if (n > nres || nres-n >= MAXRES) { |
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fprintf(stderr, "$%d: illegal result\n", n); |
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return(0.0); |
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} |
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return(result[(n-1)%MAXRES]); |
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} |
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|
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|
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void |
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eputs(const char *msg) |
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{ |
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fputs(msg, stderr); |
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} |
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|
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|
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void |
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wputs(const char *msg) |
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{ |
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eputs(msg); |
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} |
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|
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|
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void |
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quit(int code) |
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{ |
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if (recover) /* a cavalier approach */ |
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longjmp(env, 1); |
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exit(code); |
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} |
